Process for intaglio-printing.



C. BLECHER.

PROCESS FR INTAGLIO PRINTING. APPLICATION man MAY 221915 l,25@,421 Patente Bea. 18, 1912..

angefangen noch 111 (t beendet. un beendet.

fortgesetzt noch nich-X beendet. a und.

UNITED STATES PATENT OFFICE PROGESS F03 IN'IAGLIO-IRINTING.

1pplication filed May 22, 1915. Seri; No; 29,090.

Ii1 the drawings,?

T all whom z't may concem: Figure l 1s a ieW in p1an o1 a diapositive Be it known that I, CARL BLECHER, a, subject of the King of Prussia, residing a1: Bern1ade accoi;ding to the presenfi; invention;

4Theoretically, the same conditions are*i n illustrationiscoveredwith the lat:quer.-

Y doneavay with.

. forms are employed.

lin-Dahlem, in the Kingdom of Prussia, Fig. 2is a diagrammatiotransverse sec German Empire, have invented a new and t10n 0f a Pi t (negative i 611 an useful Process f0r Intaglio-Printing, of larged scal which t he following is a spcification. Accoring t0 Fig. 1 of the dra'wings, a;

T his 1nventi0n relates to a process f0r prediapoSitive'zi made from text and illustraparmg pyinting surfaces for intaglio printtions in any suitable manner, e. g., by means 1ng on h1gh speed printing presses and has of a. dry plate. The text having been printfor 1ts prunary ob ect to reduce to a minied on White paper, it, together with the illuslill}m the amount of time required.for cartration is mountfid on white cardboard. A rymg out a process of this nature. For this negative is made therefrom from which in Secificertion of Letters Patei1t. Patented Deb. 18, 1917.

purpose the text and illustrations Whih are turn the diapositive is taken. Said diaposito be reproduced, are preferably etch1fl1itive contains the text upon a ground 2 which multaneously and the use of a protecting is as transparent apossible, the picture beband of lacquer of more or lass breadth for ing arranged within the free spaces in prosharply defining the edges of the pictures, portionally the sam6size and form-in which thereby results, especi ally when Cylindrical This diapositive 'containing text and illus- In order to etch text and illustrations sicelluloid gr othersubstance provided on one multa'neously, theoretically, it would be necside with a light-sensitive coating having essary to have the gelatin relief pf the text light porti'ons 3 and shndoW portions Q, l. ground higher than that of the highest light s is treated 0n the li ght-sensitive coatingside of the pictures, for-only in this way can the by c0vering the surface except the illustrahighest lights of the pictures be etched to the tion, with an asphalt lacquer. O1 if the required degree without etching the ground non-picture side is treated, its surface isf first of the text which is not permis sible b ofore c oyered with glue, celluloid or the lik6and the picture etching has been corrqileted. -l after drying, all of the surface outsideof the en volvedin dispensing with-the laequer bandjthe diapositive is placed in a solutionof :Eor shxu:ply defini11g the pictures. Thus, if coal-tar or other non-actinic dye,-the e nt ire the piotl'eson the printin surface are surdiapositive being thus prepared for hinderrounded by a gelat1n relie which is higher ing the transmission of light to any suitable A great saving of ti t heyare to show up in the reproduction.

trations'is a very thin sheet of gelatin or than thgrglief in the highest lights of said degree. After this the lacquer is Washed Picturslijgd if said surroundin'g relief is ofl. The purpose of*this treatment is to sharpl-y de'fined from the pictures (as re make it possible to copy the diapo'sitiv'e con-' ired by the prints) it is possible, whentaining text and illustrationsupon the pl'atge.

u xe difierende in relief betwizen the highest. or cylinder in a mannet which without any lights, and their surroundinfgs is properly furthertreatment shows a relief which is rstzetching-of Proportional to the non-actinic djeof the a ll sh'ades of the pictures which are shorply gp ictures{ the highest lights of the illustraproportioned, to obtain the defined from a colorless surrounding. The tions being less' in relief than the teXt solution ofthis double' pr.oblem depends .ground. u im. the fact that the 'relief on the surface when it is higher. The present invention and b corresponding respectivelfy tojhe v contemplates sucha. refief fopmation on thl; empty. space between i}lustration' zind teXt cyfmder or plizta for thg pur'poseof prepsirand the space surroundpxg t he tex1; &rtQ-the ing the intag'li'printing surface containing high hght portion Wh1ch h1nde ns1he trimst4e'xtund illustmtionshy employing a diamission oflight due to the nofi-acfimio Qye 'tive with certain qualities. The process With which it has been eate'id. It will; beo

seen theref0re that that part of the diaposim thns c'arri ed out. in the quickest maimer pomi blef tiye which carries the i'llustration, is colored 0 1 1fifl Referring new to Fig. 2, the niegative1reo the cylinder or platze etches through less lief comprises fully transpare'nt porfiions a .positive outside of the illustrations are first coated With asphalt lacquer 01' the like, the

- contours 0f. the pictures being observed exactly. The lacquered diapositive is' then placed for a certain lengi;h of time in a suitable solution such e. g. as red coal tar dye in some instances or Potassixim permangaha te in other instances. The coat of the diapmitiv has absorbed certain quantities of the coa1 tar dye Which produces a suitable brown under the influence of the soli1tion of potassium permanganate. The colors thus 'obtained are therefore light-absorbing. The

lacquer is washed 05 after drying alle diapositive.

In order to eflect' the dyeirig outsiddthd coat 0f illust rations the combined diapositive is first covered With celluloid, glue or the 1ike; the dried coat outside of the illustratio-ns being covered witli asphalt lacquer while exactly observing the contours of the illustrations.

glue 01 other coat the light is suitablv softened.

What I claim is:

l. The process for preparing printing surfaces for intaglio printing, Which process consists in preparing a diapositive with text and illustrations and in treating that part of the diapositive which corresponds t0 the illustrations 130 reduce the power 0f said part to transmit light therethrough.

2. The process of preparing intaglio printing surfaces, Which process Consists in preparing a diapositive with text and illustrations, in coloring tha'm part of said diapositive which corresponds t0 said illustrations to reduce the power 0f said part t0 permit light to pass therethrough.

In testimony whereofl h:we hereunto set my band in presence of two sb scribing wit nesses.

CARL BLECHER.

Witnesses IVOLDEMAR HAUPT, HENRY Z'IASIER. 

